Momentum dissipation of jet dispersion in a gas-solid fluidized bed

The gas velocity profiles of vertically artificial jet dispersion within a 0.188 m I.D. gas-solid fluidized bed were experimentally studied with a pit ot tube for Gerdart-group B particles. Experimental parameters investigated included particle sizes, static bed height, nozzle diameter, nozzle exit v elocity, grid superficial velocity, and jet location above the jet nozzle i nlet. The axial jet velocities were measured at 11, 41, and 66 mm above the jet nozzle. Universal velocity profiles were applied to fit the experiment al data of the decay of jet dispersion with radial distribution, and gas ve locity on the jet axis was correlated to the system variables as: U-m/U-j = 16.91D(0) (- 0.231) U-j (-0.483) X-0.258 D-p (-0.253). Also, a 400mm x 35m m 2-D bed was used to observe the jet behavior that was significantly diffe rent depending on the operating conditions in the bed. The degree of partic le turbulence in 2-D bed was larger at high grid superficial velocity, and the stability of jet was enhanced with increasing particle sizes and decrea sing grid superficial velocity.